A hospital worker has been released on bail having been arrested on suspicion of murder after a patient died from a suspected drug overdose in Norfolk.

James May, 76, from Great Yarmouth, died at the James Paget Hospital in Gorleston on September 20.

An allegation of medical malpractice in connection with his death was reported to the police 10 days later.

Officers arrested the middle-aged male suspect on suspicion of murder on Saturday morning. He was released later in the day and told to attend a police station at a later date.

Mr May died from heart failure according to a post-mortem examination carried out at the Norfolk and Norwich University Hospital on Wednesday.

Police are waiting for the results of further toxicology tests, which they say will help their murder investigation.

Image Caption:The hospital called police after investigating Mr May's death

Detective Chief Inspector Paul Durham, leading the inquiry, said: "We are investigating an allegation that a drugs overdose was administered to a patient, leading to his death.

"We understand that this news may generate concern and it's important for us to underline that our investigation, which is still at an early stage, is based on a single report of an isolated incident and that the hospital trust is co-operating fully with the investigation."

Mr May's family have been informed and are being supported by police family liaison officers. It is understood he was admitted to hospital the day before he died.

In a written tribute to local newspaper The Eastern Daily Press, friends of Mr May wrote: "You were one in a million and will be sadly missed. Sleep peacefully."

Image Caption:Mr May died at the hospital in Great Yarmouth two weeks ago

Christine Allen, the chief executive of James Paget University Hospitals trust, said doctors called in police after an internal investigation into Mr May's death.

"Our thoughts are with the family of this patient at what is a very difficult time," she said. "Our priority is patient safety and we understand that this news will cause concern.

"At this time, we believe it is an isolated incident and relates to the alleged action of a single member of staff.

"The member of staff against whom the allegation has been made is absent from the Trust and will not return until the investigation is completed.

"Throughout this difficult period, the James Paget University Hospital will continue to provide the best possible care to our patients and we are fully co-operating with the police."

:: Police said anyone with concerns can contact the Norfolk and Suffolk Major Investigation Team on 01953 424533 or 424528.